doc(ParamType): add note about registering before using
doc(ParamType): add note about registering before using

wawyed/ng2,mattlewis92/ui-router,angular-ui/ui-router,ui-router/angular,fpipita/ui-router,mattlewis92/ui-router,wawyed/ng2,codersongs/codersongs.github.io,fpipita/ui-router,ui-router/ng2,ui-router/core,ui-router/angular,ui-router/ng2,codersongs/codersongs.github.io,ui-router/angular,angular-ui/ui-router,ui-router/angular,ui-router/core,wawyed/ng2,angular-ui/ui-router,fpipita/ui-router